You're close.
The correct JCV file for the mapset must be located in a Folder called JCV in the same part of the device as the map it is made for.
Both maps will use their correctly allocated JCV file.
If the map is on the SD card, in a folder called Map or Garmin (either is fine for the map), then you need to put the JCV folder with file in it in the Garmin folder in the root of the drive if you have it already, if not create it. It needs to be in this folder
Correct path is SD card: Garmin/JCV/your jcv file
If the map is in the 1450/90 .system folder then the JCV file goes in the JCV folder.
Correct path is Nuvi:.System/JCV/your jcv file
If the extra map is in a folder called Map in the root of the 1450/90 device then you need to put the JCV file In JCV Folder for that map in the Garmin folder in the root of the device.
Correct path is Nuvi: Garmin/JCV/your jcv file
Hope that makes sense.
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